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It's been awhile since I installed mine, but I'll try to help. I had no problems getting mine to seal. I took the old one off, scraped the scale off, chased the threads and then blew the holes out with compressed air. It's never had an issue, and it's been about 2 years. I really like the billet compared to the stamped metal housing.
I thought I was a real smart cookie. WGAS about the instructions. I knew better. Well, I had leaks. Couldn't stop it to save my life. This time, I got fresh long bolts (One of the OEM ones is short, IIRC), cleaned the surface, put the housing down, tighten them one at a time and went around getting it tighter and tighter and now there are no leaks. I did it previously by tightening one end down, then the other and then the other. Bad move. Snug them up and tighten bit by bit. I also replaced the O-ring with a Ford one.
I too scraped the surface to insure a good seal with the billet housing. Then I screwed the housing down the same way Andrew did, by snugging one screw down at a time, then tightening them down one at a time.
I used the O-ring that came with the thermo from Dieselsite.
I too scraped the surface to insure a good seal with the billet housing. Then I screwed the housing down the same way Andrew did, by snugging one screw down at a time, then tightening them down one at a time.
I used the O-ring that came with the thermo from Dieselsite.
No problems whatsoever.
Stewart
FYI, If I had done it right the first time, I would not have to do it again. Like they say, do it once, do it right and you don't have to redo. I thought I knew better and snugged them tight one at a time without doing it right. I suspect the O-ring was fine except for the fact that I don't reuse O-rings once I remove them and I couldn't get another one from Dieselsite as fast as the Ford dealership down the road.
couple years on mine and no leaks whatsoever. I don't think i would even consider staying with a stock housing ever again after looking at the difference.
I also have the 203 thermostat, don't notice any issues with water or egt, although I don't have a oil temp gauge so can't give any info there.
I just installed mine about two months ago. The only issue I have is one of the bolts broke. I fought a while to get it out and gave up figuring I would need to replace the water pump to fix the issue. Well I had to use my pickup the next morning so I tightened up two bolts on the new housing hoping for only a small leak. Much to my surprise I had no leak. Still have no leak! I have been watching it for a hint of a leak, but it is dry as a bone. That bullet housing is strong enough to seal with only 2 of the 3 bolts. I do however have a water pump waiting for free time to swap it.